implementation of base isolation in retrofit applications · forell / elsesser engineers, inc....
TRANSCRIPT
![Page 1: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/1.jpg)
Forell / Elsesser Engineers, Inc.
100th Anniversary Earthquake Conference
Commemorating the 1906 San Francisco Earthquake
Implementation of Base Isolation Implementation of Base Isolation in Retrofit Applicationsin Retrofit Applications
Presented bySimin Naaseh, SE, Principal Mason Walters, SE, Principal
Forell/Elsesser Engineers, Inc.April 17th, 2006
![Page 2: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/2.jpg)
Forell / Elsesser Engineers, Inc.
Impetus for Base Isolation of Existing Buildings
Enhanced seismic protectionEnhanced seismic protection
Reduced extent of Reduced extent of superstructure retrofitsuperstructure retrofit
Protection of historic fabricProtection of historic fabric
Protection of valuable contentsProtection of valuable contents
Cost advantageCost advantage
![Page 3: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/3.jpg)
Forell / Elsesser Engineers, Inc.
Technical Issues Unique to Base Isolation Retrofit
Isolation system is designed Isolation system is designed to meet certain thresholdsto meet certain thresholds
Limited existing structure Limited existing structure capacitycapacity
Unique dynamic response of Unique dynamic response of the structurethe structure
Limits on floor accelerationLimits on floor acceleration
Limits on moat dimensionLimits on moat dimension
![Page 4: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/4.jpg)
Forell / Elsesser Engineers, Inc.
Base Isolation RetrofitPlanning and Design Challenges
Accommodating the isolator Accommodating the isolator spacespace
Accommodating the moatAccommodating the moat
Retrofitting the building Retrofitting the building appendages to accommodate appendages to accommodate free movement free movement
Retrofitting stairs and elevators Retrofitting stairs and elevators to accommodate large to accommodate large displacementsdisplacements
![Page 5: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/5.jpg)
Forell / Elsesser Engineers, Inc.
Base Isolation RetrofitConstruction Challenges
Minimize building vulnerability Minimize building vulnerability during constructionduring construction
Minimize impact on brittle Minimize impact on brittle elementselements
Isolator installation sequenceIsolator installation sequence
![Page 6: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/6.jpg)
Forell / Elsesser Engineers, Inc.
Seismic Retrofit of San Francisco City Hall
![Page 7: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/7.jpg)
Forell / Elsesser Engineers, Inc.
Historic Rotunda
![Page 8: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/8.jpg)
Forell / Elsesser Engineers, Inc.
Major Earthquake Response Issues
![Page 9: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/9.jpg)
Forell / Elsesser Engineers, Inc.
Fixed Base Response - Shear Walls
![Page 10: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/10.jpg)
Forell / Elsesser Engineers, Inc.
Major Earthquake Response Issues
![Page 11: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/11.jpg)
Forell / Elsesser Engineers, Inc.
Fixed Base Response
![Page 12: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/12.jpg)
Forell / Elsesser Engineers, Inc.
Base Isolated Response
![Page 13: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/13.jpg)
Forell / Elsesser Engineers, Inc.
Sequence of Construction
![Page 14: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/14.jpg)
Forell / Elsesser Engineers, Inc.
New Foundation
![Page 15: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/15.jpg)
Forell / Elsesser Engineers, Inc.
New Foundation
![Page 16: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/16.jpg)
Forell / Elsesser Engineers, Inc.
New Foundation
![Page 17: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/17.jpg)
Forell / Elsesser Engineers, Inc.
Column Jacking
![Page 18: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/18.jpg)
Forell / Elsesser Engineers, Inc.
Column Cutting
![Page 19: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/19.jpg)
Forell / Elsesser Engineers, Inc.
Installation of Base Isolators
![Page 20: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/20.jpg)
Forell / Elsesser Engineers, Inc.
Perimeter Shoring
![Page 21: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/21.jpg)
Forell / Elsesser Engineers, Inc.
Perimeter Side Beams
![Page 22: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/22.jpg)
Forell / Elsesser Engineers, Inc.
Perimeter Side Beams
![Page 23: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/23.jpg)
Forell / Elsesser Engineers, Inc.
Installed Isolators at Perimeter
![Page 24: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/24.jpg)
Forell / Elsesser Engineers, Inc.
New Ground Floor
![Page 25: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/25.jpg)
Forell / Elsesser Engineers, Inc.
New Shear Walls
![Page 26: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/26.jpg)
Forell / Elsesser Engineers, Inc.
Berkeley Civic Center
![Page 27: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/27.jpg)
Forell / Elsesser Engineers, Inc.
C
Isolators at Basement
Section Looking West
![Page 28: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/28.jpg)
Forell / Elsesser Engineers, Inc.
C
Basement Wall / Jacking Pier Construction Sequence
![Page 29: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/29.jpg)
Forell / Elsesser Engineers, Inc.
C
Column Jacking / Isolator Installation Construction Sequence
![Page 30: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/30.jpg)
Forell / Elsesser Engineers, Inc.
Existing Condition
![Page 31: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/31.jpg)
Forell / Elsesser Engineers, Inc.
Install Foundation Reinforcing
![Page 32: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/32.jpg)
Forell / Elsesser Engineers, Inc.
New Foundation Built
![Page 33: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/33.jpg)
Forell / Elsesser Engineers, Inc.
Install Formwork for Jacking Piers Around Existing Columns
![Page 34: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/34.jpg)
Forell / Elsesser Engineers, Inc.
Jacking Pier Construction
![Page 35: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/35.jpg)
Forell / Elsesser Engineers, Inc.
Jacking Pier Built
![Page 36: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/36.jpg)
Forell / Elsesser Engineers, Inc.
Temporary Jacks Installed
![Page 37: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/37.jpg)
Forell / Elsesser Engineers, Inc.
Existing Column Cut
![Page 38: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/38.jpg)
Forell / Elsesser Engineers, Inc.
Existing Column Cut
![Page 39: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/39.jpg)
Forell / Elsesser Engineers, Inc.
Isolator Installed
![Page 40: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/40.jpg)
Forell / Elsesser Engineers, Inc.
Isolator Installed
![Page 41: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/41.jpg)
Forell / Elsesser Engineers, Inc.
Isolator Locking Plates Installed
![Page 42: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/42.jpg)
Forell / Elsesser Engineers, Inc.
Steel Bracing Installed
![Page 43: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/43.jpg)
Forell / Elsesser Engineers, Inc.
Locking Plates Removed
![Page 44: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/44.jpg)
Forell / Elsesser Engineers, Inc.
Isolators Installed
![Page 45: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/45.jpg)
Forell / Elsesser Engineers, Inc.
Base Isolation Response at Perimeter Wall
![Page 46: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/46.jpg)
Forell / Elsesser Engineers, Inc.
Design an ConstructionProblems and Solutions
![Page 47: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/47.jpg)
Forell / Elsesser Engineers, Inc.
Construction Problems and Solutions
Sequence of operationsSequence of operations
Symmetry and balanceSymmetry and balance
Cutting and jackingCutting and jacking
PreloadingPreloading
Temporary lateral strengthTemporary lateral strength
![Page 48: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/48.jpg)
Forell / Elsesser Engineers, Inc.
Structure Types
Unreinforced Unreinforced masonry bearing wallmasonry bearing wall
Steel / masonry infillSteel / masonry infill
Reinforced concreteReinforced concrete
![Page 49: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/49.jpg)
Forell / Elsesser Engineers, Inc.
Example: Unreinforced Masonry Bearing Wall Building
![Page 50: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/50.jpg)
Forell / Elsesser Engineers, Inc.
Salt Lake City and County Building
![Page 51: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/51.jpg)
Forell / Elsesser Engineers, Inc.
Bearing Wall Sequence
![Page 52: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/52.jpg)
Forell / Elsesser Engineers, Inc.
Bearing Wall Sequence
![Page 53: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/53.jpg)
Forell / Elsesser Engineers, Inc.
Isolator Installed at Perimeter
![Page 54: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/54.jpg)
Forell / Elsesser Engineers, Inc.
Example: Steel Framed Building
with Masonry Infill
![Page 55: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/55.jpg)
Forell / Elsesser Engineers, Inc.
Oakland City Hall
![Page 56: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/56.jpg)
Forell / Elsesser Engineers, Inc.
Identification of Existing Building Properties
Archaic materials and infill systemsArchaic materials and infill systems
Structure’s Modal frequenciesStructure’s Modal frequencies
Forced/Ambient Vibration TestsForced/Ambient Vibration Tests
Historic DataHistoric Data
Old Old AccelerogramsAccelerograms
Masonry infill example Masonry infill example
![Page 57: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/57.jpg)
Forell / Elsesser Engineers, Inc.
Identification of Existing Building Properties
Tests of Existing MasonryTests of Existing Masonry
InIn--situ cyclic testssitu cyclic tests
Obtain shear stressObtain shear stress--strain relation, Gstrain relation, G
Obtain diagonal cracking strain,Obtain diagonal cracking strain, ggcrcr
Use G for elastic modeling of structureUse G for elastic modeling of structure
Use Use ggcrcr to determine the limits of to determine the limits of acceptable interacceptable inter--story driftstory drift
![Page 58: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/58.jpg)
Forell / Elsesser Engineers, Inc.
In-Situ Masonry Test
![Page 59: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/59.jpg)
Forell / Elsesser Engineers, Inc.
Stress Versus Deflection
![Page 60: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/60.jpg)
Forell / Elsesser Engineers, Inc.
Local Wall Model
![Page 61: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/61.jpg)
Forell / Elsesser Engineers, Inc.
ETABS Model
(Non-Linear ANSR)
![Page 62: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/62.jpg)
Forell / Elsesser Engineers, Inc.
![Page 63: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/63.jpg)
Forell / Elsesser Engineers, Inc.
![Page 64: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/64.jpg)
Forell / Elsesser Engineers, Inc.
Jacking of Existing Column
![Page 65: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/65.jpg)
Forell / Elsesser Engineers, Inc.
Column Cutting
![Page 66: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/66.jpg)
Forell / Elsesser Engineers, Inc.
Example: Reinforced Concrete
Frame Buildings
![Page 67: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/67.jpg)
Forell / Elsesser Engineers, Inc.
Pasadena City Hall
![Page 68: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/68.jpg)
Forell / Elsesser Engineers, Inc.
Building Section Showing Load Transfer
8
3
(E) Column
7
2
59
6
1(E) Footing (to be Removed)
1
(E) Wall
(E) Basement Grade
1 Shoring
2 Foundation
3
4
5
6
7
8
9
(E) Wall
Moat Cover
4
Grade Beam & S.O.G. Friction Pendulum Isolator PT Threadbar(Clamping Reinforcing)
Concrete Pedestal
Temporary Shoring
PT Conc. Transfer Girder
Concrete Slab
![Page 69: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/69.jpg)
Forell / Elsesser Engineers, Inc.
Installation of Isolators
![Page 70: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/70.jpg)
Forell / Elsesser Engineers, Inc.
Utah State Capital Building
![Page 71: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/71.jpg)
Forell / Elsesser Engineers, Inc.
Overall Basement
Plan
![Page 72: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/72.jpg)
Forell / Elsesser Engineers, Inc.
![Page 73: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/73.jpg)
Forell / Elsesser Engineers, Inc.
Big Idea
Rotunda base must be isolated with Rotunda base must be isolated with remainder of buildingremainder of building
Main problem Main problem –– getting isolators “beneath” getting isolators “beneath” rotunda footingrotunda footing
“Below” and “Above” approaches studied“Below” and “Above” approaches studied
“Above” approach safer to build, requires “Above” approach safer to build, requires less excavationless excavation
![Page 74: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/74.jpg)
Forell / Elsesser Engineers, Inc.
Big Idea
Existing concrete has relatively good Existing concrete has relatively good quality, strengthquality, strength
Maintain footing Maintain footing –– make it work as part of make it work as part of new transfer girdernew transfer girder
“Composite”“Composite”
Allow new transfer structure to span to Allow new transfer structure to span to isolators on new foundations (fig)isolators on new foundations (fig)
New foundation can be built ahead of New foundation can be built ahead of transfer transfer –– outside existing footingoutside existing footing
![Page 75: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/75.jpg)
Forell / Elsesser Engineers, Inc.
Existing Footing
![Page 76: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/76.jpg)
How to Achieve Composite Action and Transfer Load?
Stress Girders
![Page 77: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/77.jpg)
Forell / Elsesser Engineers, Inc.
![Page 78: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/78.jpg)
Forell / Elsesser Engineers, Inc.
Locate and Mark PT Ducts on Flange
How to Achieve Composite Action and Transfer Load?
![Page 79: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/79.jpg)
Forell / Elsesser Engineers, Inc.
Rotunda Footing
![Page 80: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/80.jpg)
Forell / Elsesser Engineers, Inc.
![Page 81: Implementation of Base Isolation in Retrofit Applications · Forell / Elsesser Engineers, Inc. Technical Issues Unique to Base Isolation Retrofit ¾Isolation system is designed to](https://reader036.vdocuments.us/reader036/viewer/2022081522/5f028e8b7e708231d404da73/html5/thumbnails/81.jpg)
Forell / Elsesser Engineers, Inc.
100th Anniversary Earthquake Conference
Commemorating the 1906 San Francisco Earthquake
Implementation of Base Isolation Implementation of Base Isolation in Retrofit Applicationsin Retrofit Applications
Presented bySimin Naaseh, SE, Principal Mason Walters, SE, Principal
Forell/Elsesser Engineers, Inc.April 17th, 2006